UNIT DOES WORK, BUT THE DRIVERS ARE WEAK. I PUT NEW TUBES IN THIS UNIT FROM MY OTHER UNIT AND IT WILL DO OVER 300 WATTS ON 5 TO 7 WATTS DRIVE EASILY, BUT I CANNOT SELL THESE TUBES. SO HERE IS WHAT YOU NEED (3) 6JT6''s OR (3) 6JG6''s, AND NOT 6KV6''s EITHER, AND 1 6LQ6 AND YOU ARE BACK IN BUSINESS. ALL METERS WORK AND FILTERS ARE GOOD. WORKS ON LOW AND HIGH. SOMEONE PUT THE FAN ON THE SIDE OF THE CASE AND OF ALL THINGS THEY ARE BLOWING THE AIR ON THE TUBES WHEN THIS UNIT HAS A PERFORATED METAL CASE, AND NOW THE HOT AIR GOES ON THE TRANSFORMERS. TAKE THAT FAN AND TURN IT AROUND AND SUCK ALL THE HOT AIR OUT OF THE CABINET, AND NOW THE TUBES WILL BE MUCH COOLER, AS WELL AS ALL THE COMPONENTS, LIKE THOSE BIG POWER TRANSFORMERS, FAN WORKS TWO TERMINALS ON THE END OF THE FAN AND IT WILL TAKE 110 TO 125 VAC TO RUN IT.